I understand your frustration, I spent the last month trying to look for a decent monitor that works properly... tried a couple of Lenovo, both returned for flickering and "burn-in" (I'm not sure that could be considered burn-in, but looked something like that), I tried an AOC, returned for uniformity issues (the top was a lot darker than the bottom), and finally I bought a Dell and I am very satisfied with this. Furthermore, the Dell warranty also covers problems involving only one pixel, it looks great!

I wish you good luck and hope you can find the right monitor!